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<h1>Vulkan on Android Implementor&#8217;s Guide</h1>
<span id="revnumber">version 5</span>
<div id="toc">
  <div id="toctitle">Table of Contents</div>
  <noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>This document is intended for GPU IHVs writing Vulkan drivers for Android, and OEMs integrating them for specific devices. It describes how a Vulkan driver interacts with the system, how GPU-specific tools should be installed, and Android-specific requirements.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_architecture">1. Architecture</h2>
<div class="sectionbody">
<div class="paragraph"><p>The primary interface between Vulkan applications and a device&#8217;s Vulkan driver is the loader, which is part of AOSP and installed at <span class="monospaced">/system/lib[64]/libvulkan.so</span>. The loader provides the core Vulkan API entry points, as well as entry points of a few extensions that are required on Android and always present. In particular, the window system integration (WSI) extensions are exported by the loader and primarily implemented in it rather than the driver. The loader also supports enumerating and loading layers which can expose additional extensions and/or intercept core API calls on their way to the driver.</p></div>
<div class="paragraph"><p>The NDK will include a stub <span class="monospaced">libvulkan.so</span> exporting the same symbols as the loader. Calling the Vulkan functions exported from <span class="monospaced">libvulkan.so</span> will enter trampoline functions in the loader which will dispatch to the appropriate layer or driver based on their first argument. The <span class="monospaced">vkGet*ProcAddr</span> calls will return the function pointers that the trampolines would dispatch to, so calling through these function pointers rather than the exported symbols will be slightly more efficient since it skips the trampoline and dispatch.</p></div>
<div class="sect2">
<h3 id="_driver_enumeration_and_loading">1.1. Driver Enumeration and Loading</h3>
<div class="paragraph"><p>Android expects the GPUs available to the system to be known when the system image is built, so its driver enumeration process isn&#8217;t as elaborate as on other platforms. The loader will use the existing HAL mechanism for discovering and loading the driver. As of this writing, the preferred paths for 32-bit and 64-bit Vulkan drivers are:</p></div>
<div class="literalblock">
<div class="content monospaced">
<pre>/vendor/lib/hw/vulkan.&lt;ro.product.platform&gt;.so
/vendor/lib64/hw/vulkan.&lt;ro.product.platform&gt;.so</pre>
</div></div>
<div class="paragraph"><p>where <span class="monospaced">&lt;ro.product.platform&gt;</span> is replaced by the value of the system property of that name. See <a href="https://android.googlesource.com/platform/hardware/libhardware/+/master/hardware.c">libhardware/hardware.c</a> for details and supported alternative locations.</p></div>
<div class="paragraph"><p>The Vulkan <span class="monospaced">hw_module_t</span> derivative is currently trivial. If support for multiple drivers is ever added, the HAL module will export a list of strings that can be passed to the module <span class="monospaced">open</span> call. For the time being, only one driver is supported, and the constant string <span class="monospaced">HWVULKAN_DEVICE_0</span> is passed to <span class="monospaced">open</span>.</p></div>
<div class="paragraph"><p>The Vulkan <span class="monospaced">hw_device_t</span> derivative corresponds to a single driver, though that driver can support multiple Vulkan physical devices. The <span class="monospaced">hw_device_t</span> structure contains a function pointer for the <span class="monospaced">vkGetInstanceProcAddr</span> function. The loader finds all other driver Vulkan functions by calling that <span class="monospaced">vkGetInstanceProcAddr</span> function.</p></div>
</div>
<div class="sect2">
<h3 id="_layer_discovery_and_loading">1.2. Layer Discovery and Loading</h3>
<div class="paragraph"><p>Android&#8217;s security model and policies differ significantly from other platforms. In particular, Android does not allow loading external code into a non-debuggable process on production (non-rooted) devices, nor does it allow external code to inspect or control the process&#8217;s memory/state/etc. This includes a prohibition on saving core dumps, API traces, etc. to disk for later inspection. So only layers delivered as part of the application will be enabled on production devices, and drivers must also not provide functionality that violates these policies.</p></div>
<div class="paragraph"><p>There are three major use cases for layers:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
Development-time layers: validation layers, shims for tracing/profiling/debugging tools, etc. These shouldn&#8217;t be installed on the system image of production devices: they would be a waste of space for most users, and they should be updateable without requiring a system update. A developer wishing to use one of these during development has the ability to modify their application package (e.g. adding a file to their native libraries directory). IHV and OEM engineers who are trying to diagnose failures in shipping, unmodifiable apps are assumed to have access to non-production (rooted) builds of the system image.
</p>
</li>
<li>
<p>
Utility layers, such as a layer that implements a heap for device memory. These layers will almost always expose extensions. Developers choose which layers, and which versions of those layers, to use in their application; different applications that use the same layer may still use different versions. Developers will choose which of these layers to ship in their application package.
</p>
</li>
<li>
<p>
Injected layers, like framerate, social network, or game launcher overlays, which are provided by the user or some other application without the application&#8217;s knowledge or consent. These violate Android&#8217;s security policies and will not be supported.
</p>
</li>
</ol></div>
<div class="paragraph"><p>In the normal state the loader will only search in the application&#8217;s normal library search path (as defined by the system ClassLoader) for layers. It will attempt to load any shared library named <span class="monospaced">libVkLayer_*.so</span> as a layer library. Android does not use manifests to describe layers: because layers must have been deliberately included in the application by the developer, the motivation for manifests on other platforms don&#8217;t apply.</p></div>
<div class="paragraph"><p>On debuggable devices (<span class="monospaced">ro.debuggable</span> property exists and is non-zero, generally rooted or engineering builds) the loader will also search the directory <span class="monospaced">/data/local/debug/vulkan</span> and attempt to load layer libraries it finds there. This directory doesn&#8217;t exist by default. On Android N and later, because this location is writable by adb, SELinux policies prevent mapping code located here as executable. So to use layers from here, SELinux enforcement must be disabled: <span class="monospaced">adb shell setenforce 0</span>. This mechanism is not intended for application developers, only for IHV and OEM engineers working on test devices that don&#8217;t have private or sensitive data.</p></div>
<div class="paragraph"><p>Our goal is to allow layers to be ported with only build-environment changes between Android and other platforms. For this to work, layers must properly implement things like <span class="monospaced">vkGetInstanceLayerProperties</span> and <span class="monospaced">vkGetInstanceExtensionProperties</span>, even though the LunarG loader doesn&#8217;t use them (it gets the information from manifests instead).</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_window_system_integration">2. Window System Integration</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <span class="monospaced">vk_wsi_swapchin</span> and <span class="monospaced">vk_wsi_device_swapchain</span> extensions are primarily be implemented by the platform and live in <span class="monospaced">libvulkan.so</span>. The <span class="monospaced">VkSwapchain</span> object and all interaction with <span class="monospaced">ANativeWindow</span> will be handled by the platform and not exposed to drivers. The WSI implementation will rely on a few private interfaces to the driver for this implementation. These will be loaded through the driver&#8217;s <span class="monospaced">vkGetDeviceProcAddr</span> functions, after passing through any enabled layers.</p></div>
<div class="paragraph"><p>Implementations may need swapchain buffers to be allocated with implementation-defined private gralloc usage flags. When creating a swapchain, the platform will ask the driver to translate the requested format and image usage flags into gralloc usage flags by calling</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>VkResult <span style="color: #008080">VKAPI</span> <span style="font-weight: bold"><span style="color: #000000">vkGetSwapchainGrallocUsageANDROID</span></span><span style="color: #990000">(</span>
    <span style="color: #008080">VkDevice</span>            device<span style="color: #990000">,</span>
    <span style="color: #008080">VkFormat</span>            format<span style="color: #990000">,</span>
    <span style="color: #008080">VkImageUsageFlags</span>   imageUsage<span style="color: #990000">,</span>
    <span style="color: #009900">int</span><span style="color: #990000">*</span>                grallocUsage
<span style="color: #990000">);</span></tt></pre></div></div>
<div class="paragraph"><p>The <span class="monospaced">format</span> and <span class="monospaced">imageUsage</span> parameters are taken from the <span class="monospaced">VkSwapchainCreateInfoKHR</span> structure. The driver should fill <span class="monospaced">*grallocUsage</span> with the gralloc usage flags it requires for that format and usage. These will be combined with the usage flags requested by the swapchain consumer when allocating buffers.</p></div>
<div class="paragraph"><p><span class="monospaced">VkNativeBufferANDROID</span> is a <span class="monospaced">vkCreateImage</span> extension structure for creating an image backed by a gralloc buffer. This structure is provided to <span class="monospaced">vkCreateImage</span> in the <span class="monospaced">VkImageCreateInfo</span> structure chain. Calls to <span class="monospaced">vkCreateImage</span> with this structure will happen during the first call to <span class="monospaced">vkGetSwapChainInfoWSI(.. VK_SWAP_CHAIN_INFO_TYPE_IMAGES_WSI ..)</span>. The WSI implementation will allocate the number of native buffers requested for the swapchain, then create a <span class="monospaced">VkImage</span> for each one.</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="font-weight: bold"><span style="color: #0000FF">typedef</span></span> <span style="font-weight: bold"><span style="color: #0000FF">struct</span></span> <span style="color: #FF0000">{</span>
    <span style="color: #008080">VkStructureType</span>             sType<span style="color: #990000">;</span> <span style="font-style: italic"><span style="color: #9A1900">// must be VK_STRUCTURE_TYPE_NATIVE_BUFFER_ANDROID</span></span>
    <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> <span style="color: #009900">void</span><span style="color: #990000">*</span>                 pNext<span style="color: #990000">;</span>

    <span style="font-style: italic"><span style="color: #9A1900">// Buffer handle and stride returned from gralloc alloc()</span></span>
    <span style="color: #008080">buffer_handle_t</span>             handle<span style="color: #990000">;</span>
    <span style="color: #009900">int</span>                         stride<span style="color: #990000">;</span>

    <span style="font-style: italic"><span style="color: #9A1900">// Gralloc format and usage requested when the buffer was allocated.</span></span>
    <span style="color: #009900">int</span>                         format<span style="color: #990000">;</span>
    <span style="color: #009900">int</span>                         usage<span style="color: #990000">;</span>
<span style="color: #FF0000">}</span> VkNativeBufferANDROID<span style="color: #990000">;</span></tt></pre></div></div>
<div class="paragraph"><p>When creating a gralloc-backed image, the <span class="monospaced">VkImageCreateInfo</span> will have:</p></div>
<div class="listingblock">
<div class="content monospaced">
<pre>  .imageType           = VK_IMAGE_TYPE_2D
  .format              = a VkFormat matching the format requested for the gralloc buffer
  .extent              = the 2D dimensions requested for the gralloc buffer
  .mipLevels           = 1
  .arraySize           = 1
  .samples             = 1
  .tiling              = VK_IMAGE_TILING_OPTIMAL
  .usage               = VkSwapChainCreateInfoWSI::imageUsageFlags
  .flags               = 0
  .sharingMode         = VkSwapChainCreateInfoWSI::sharingMode
  .queueFamilyCount    = VkSwapChainCreateInfoWSI::queueFamilyCount
  .pQueueFamilyIndices = VkSwapChainCreateInfoWSI::pQueueFamilyIndices</pre>
</div></div>
<div class="paragraph"><p><span class="monospaced">vkAcquireImageANDROID</span> acquires ownership of a swapchain image and imports an
externally-signalled native fence into both an existing VkSemaphore object
and an existing VkFence object:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>VkResult <span style="color: #008080">VKAPI</span> <span style="font-weight: bold"><span style="color: #000000">vkAcquireImageANDROID</span></span><span style="color: #990000">(</span>
    <span style="color: #008080">VkDevice</span>            device<span style="color: #990000">,</span>
    <span style="color: #008080">VkImage</span>             image<span style="color: #990000">,</span>
    <span style="color: #009900">int</span>                 nativeFenceFd<span style="color: #990000">,</span>
    <span style="color: #008080">VkSemaphore</span>         semaphore<span style="color: #990000">,</span>
    VkFence             fence
<span style="color: #990000">);</span></tt></pre></div></div>
<div class="paragraph"><p>This function is called during <span class="monospaced">vkAcquireNextImageWSI</span> to import a native
fence into the <span class="monospaced">VkSemaphore</span> and <span class="monospaced">VkFence</span> objects provided by the
application. Both semaphore and fence objects are optional in this call. The
driver may also use this opportunity to recognize and handle any external
changes to the gralloc buffer state; many drivers won&#8217;t need to do anything
here. This call puts the <span class="monospaced">VkSemaphore</span> and <span class="monospaced">VkFence</span> into the same "pending"
state as <span class="monospaced">vkQueueSignalSemaphore</span> and <span class="monospaced">vkQueueSubmit</span> respectively, so queues
can wait on the semaphore and the application can wait on the fence. Both
objects become signalled when the underlying native fence signals; if the
native fence has already signalled, then the semaphore will be in the signalled
state when this function returns. The driver takes ownership of the fence fd
and is responsible for closing it when no longer needed. It must do so even if
neither a semaphore or fence object is provided, or even if
<span class="monospaced">vkAcquireImageANDROID</span> fails and returns an error. If <span class="monospaced">fenceFd</span> is -1, it
is as if the native fence was already signalled.</p></div>
<div class="paragraph"><p><span class="monospaced">vkQueueSignalReleaseImageANDROID</span> prepares a swapchain image for external use, and creates a native fence and schedules it to be signalled when prior work on the queue has completed.</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>VkResult <span style="color: #008080">VKAPI</span> <span style="font-weight: bold"><span style="color: #000000">vkQueueSignalReleaseImageANDROID</span></span><span style="color: #990000">(</span>
    <span style="color: #008080">VkQueue</span>             queue<span style="color: #990000">,</span>
    <span style="color: #008080">uint32_t</span>            waitSemaphoreCount<span style="color: #990000">,</span>
    <span style="font-weight: bold"><span style="color: #0000FF">const</span></span> VkSemaphore<span style="color: #990000">*</span>  pWaitSemaphores<span style="color: #990000">,</span>
    <span style="color: #008080">VkImage</span>             image<span style="color: #990000">,</span>
    <span style="color: #009900">int</span><span style="color: #990000">*</span>                pNativeFenceFd
<span style="color: #990000">);</span></tt></pre></div></div>
<div class="paragraph"><p>This will be called during <span class="monospaced">vkQueuePresentWSI</span> on the provided queue. Effects are similar to <span class="monospaced">vkQueueSignalSemaphore</span>, except with a native fence instead of a semaphore. The native fence must: not signal until the <span class="monospaced">waitSemaphoreCount</span> semaphores in <span class="monospaced">pWaitSemaphores</span> have signaled. Unlike <span class="monospaced">vkQueueSignalSemaphore</span>, however, this call creates and returns the synchronization object that will be signalled rather than having it provided as input. If the queue is already idle when this function is called, it is allowed but not required to set <span class="monospaced">*pNativeFenceFd</span> to -1. The file descriptor returned in <span class="monospaced">*pNativeFenceFd</span> is owned and will be closed by the caller. Many drivers will be able to ignore the <span class="monospaced">image</span> parameter, but some may need to prepare CPU-side data structures associated with a gralloc buffer for use by external image consumers. Preparing buffer contents for use by external consumers should have been done asynchronously as part of transitioning the image to <span class="monospaced">VK_IMAGE_LAYOUT_PRESENT_SRC_KHR</span>.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_history">3. History</h2>
<div class="sectionbody">
<div class="olist arabic"><ol class="arabic">
<li>
<p>
<strong>2015-07-08</strong> Initial version
</p>
</li>
<li>
<p>
<strong>2015-08-16</strong>
</p>
<div class="ulist"><ul>
<li>
<p>
Renamed to Implementor&#8217;s Guide
</p>
</li>
<li>
<p>
Wording and formatting changes
</p>
</li>
<li>
<p>
Updated based on resolution of Khronos bug 14265
</p>
</li>
<li>
<p>
Deferred support for multiple drivers
</p>
</li>
</ul></div>
</li>
<li>
<p>
<strong>2015-11-04</strong>
</p>
<div class="ulist"><ul>
<li>
<p>
Added vkGetSwapchainGrallocUsageANDROID
</p>
</li>
<li>
<p>
Replaced vkImportNativeFenceANDROID and vkQueueSignalNativeFenceANDROID
     with vkAcquireImageANDROID and vkQueueSignalReleaseImageANDROID, to allow
     drivers to known the ownership state of swapchain images.
</p>
</li>
</ul></div>
</li>
<li>
<p>
<strong>2015-12-03</strong>
</p>
<div class="ulist"><ul>
<li>
<p>
Added a VkFence parameter to vkAcquireImageANDROID corresponding to the
     parameter added to vkAcquireNextImageKHR.
</p>
</li>
</ul></div>
</li>
<li>
<p>
<strong>2016-01-08</strong>
</p>
<div class="ulist"><ul>
<li>
<p>
Added waitSemaphoreCount and pWaitSemaphores parameters to vkQueueSignalReleaseImageANDROID.
</p>
</li>
</ul></div>
</li>
<li>
<p>
<strong>2016-06-17</strong>
</p>
<div class="ulist"><ul>
<li>
<p>
Updates to reflect final behavior, closed some TBDs now that they&#8217;ve BDed.
</p>
</li>
</ul></div>
</li>
</ol></div>
</div>
</div>
</div>
<div id="footnotes"><hr></div>
<div id="footer">
<div id="footer-text">
Version 5<br>
Last updated 2016-06-17 13:54:25 PDT
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